Which of the following statements about the position of the dispersion module in the signal flow is wrong?

Which of the following statements about the position of the dispersion module in the signal flow is wrong?
A . If there is an OAU board, the DCM is placed between the TDC/RDC of the OAU
B . If there is only one OBU board, the DCM is placed after the OBU
C . If there are two OBU boards, the DCM is placed between the two OBUs.
D . OTM station usually pre-fills 20KM DCM before sending OBU

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Answer: B